import junit.framework.TestCase;

import java.util.Scanner;

           public class MyDCTest  {

             public static void main (String[] args) {

                 String expression, again;
                            int result;

                 try
                 {
                       Scanner in = new Scanner(System.in);

                       do
                          {
                            MyDC evaluator = new MyDC();
                             System.out.println ("Enter a valid postfix expression: ");
                             expression = in.nextLine();

                             result = evaluator.evaluate (expression);
                             System.out.println();
                             System.out.println ("That expression equals " + result);
                                                 System.out.print ("Evaluate another expression [Y/N]? ");
                             again = in.nextLine();
                             System.out.println();
                           }
                       while (again.equalsIgnoreCase("y"));
                     }
                 catch (Exception IOException)
                 {
                       System.out.println("Input exception reported");
                     }
               }
  }
